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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70ef31f5d1a1a44c7634fce0c7c83df7dc4ae2d25a6ffd6e92632abbc85f4ab' 
  AND token = 'odquQP3wVNDNmbY7Yfmd+nksFseiIFfSpFP8xzmyUWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}