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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eead1c2575379235673c6f6258f17c43bd6a2c55201fa2237f773c402071814d' 
  AND token = 'aq9VTXnyZ6ucsXWH4EYCKSaDFV+p7dBlQdo7t4oqj3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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