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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01136287c6ad1a63cd86b87b3a7eba500fe9a9f6e2a9df84f3c90b51f4de35a' 
  AND token = 'oTe/erhD2kPLL10sDCPSknBSfyitlehy6ZymLYR+jvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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