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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3afd6bff5d9bfe9112c7cca7aa67f49af83a8a66ea118cdf5d99b76d317e2c3e' 
  AND token = 'HG0q8mj3+po95EFqERTy9gF1Z9clcx8KNAcWVBlLUXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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