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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d1ea12b0ab2934e6cec4faae2adb1bca73baadae2b4ae03e200df9cbddea51' 
  AND token = '583kpogorB0KwvKP9wSuCPzOUmF65+9e+r06iETJ/sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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