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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85099b767897be9a695bd5604e5b09a1727928f40ca948d5267a0b48a0276740' 
  AND token = 'zjTuSXBQUONZY7UfFnr8baUHcGhbXOAZSnnTrVeBEMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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