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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94916958aec14171c50ecc05fc36c172f17e35e01b2385f50f33face03a4e99b' 
  AND token = 'XyGnHO1xkz2TnkUh9lBz6pSa2kuZIXs+++uSFkJUbxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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