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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb284f474940434285ce91c0946050f73055c45d32907d57cf6749d17265cb3' 
  AND token = 'YzMOxGG6Fz/o6ckH67UI68M1AWfjNIOL/lJJW2yVHAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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