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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba9fbe65e3ca52f5b8d3026af8af0b65abbdc14bf1fcd3d72dd0f94bf141afe' 
  AND token = '9C+vf/g/+r0iUAvtsX6s9eYHAGWOrwAzzdbtZXpnIek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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