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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f4ece55d8fb2fe64b1505d63691965f152544b1210d6ded4322678d87f007c' 
  AND token = '3gb7Ahhlgh1BCuUs7mg4TEBYKpZeVmGO4PWt9sUeLPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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