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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d432b37523debe603f8676d8ab4639f09f6f285c85d3aa715b8f823b96f13f' 
  AND token = 'lW/t/atHk6paSj2XWG3ufmsOnKiW2WHuC2tn4lgpFNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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