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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df50e8f31ae91945005999d182bef81dea5ded5d50379958f110345fa0c1e2d7' 
  AND token = 'Y1Z5wDYXNSpr59W6dabn2nzanozKSM87fZCAesghU+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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