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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7755ff1f7ea9ac6f02786166c613e14e8df47cd6f7a2c78d0185569e76655283' 
  AND token = '68pXRTZbb0b7e5RdQOgqpi5DvKfheD5eZhiSWtZKf7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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