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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bcc43b30144b836c5521982ef2e24f01d87d3c0b2c52b65467f577aeac1d372' 
  AND token = 'f4h8nHGcB0MnunwjerJVvxeB9T6SEcEwNeB1qROyqso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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