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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136400aa9a97e3deab8fb1b82eab1fb05a815f4d11de22cfae32f6a26fddb227' 
  AND token = 'aDq4E7/A6iJNF2yuXJmorNcZNN8tbbEERyZHMzoqdXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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