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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '075e80d73c1de4140448b9dca4016b014e7fc995dd22b5efc3c6419df523f055' 
  AND token = '+Rlah7Yp+B/u41TT22iXleQfFugXHdydsEWgYl7mLGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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