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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626fe94cc919e78cef8c0b4d5b4acbaa0e17c30ab4f3f30869d1b16212f89dba' 
  AND token = 'v6zunJV5l7EoPWkVUR4xhayu1N3w5E88G6qD1ET4fuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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