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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa90ba0487193bae66621acd7eebd1f726e5a85b037b1a5da08578ca4ed63d8f' 
  AND token = 'R53poTDU8/mtT6ppNYOnh8FpB+i2HHQNACeiDh2adXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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