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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8c2c133c4b136abb4b310f0106edcf2cf10779ae1c96236ca723b674c2aee3d' 
  AND token = 'MbnPT8ueFmbpxQEBhBYBFgmdvkMh07g292s2kAbbkHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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