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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e6cf107337402a0c25acb86c0efa9838f674b7011a7dba244b24e0cfacde3a' 
  AND token = 'F5cWr9hX1Mkg/yaUDfraO05dm/OUUmgVrGz7euqkKOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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