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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd9d9efe66d0db0421c3b8ec4442d38b7a01d98cf6c806f8e2cc9da9408b498' 
  AND token = 'tRGRJeVJNxUEaYPAH5IwwQztd1aqkoP4/kRA+M2Jag4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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