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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d04dfccbcd5cffc22ca1bb8fd6e8d957331ed0bc4fdd1fccfe05236e5d7125e' 
  AND token = 'iaMgLR0Md1j9eGpkfwUPF7r96Cdku3mHs5i7oJJXYgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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