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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e7428d82efdee1a61513827a83fe3c2fefa97aa1432d5a4810c87a7d5643f81' 
  AND token = 'KaJtlQrrlknYOjcN8vY3FBQa5pjYQkkmUvJwb82HrDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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