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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab74da1c17e4b78d3ab8e37390968a1f52afc83faf3b399b1e652889aace5052' 
  AND token = '1Qv2ummNvBvqs1WDqZkd1Ycx+Z322qcbGFKJxMlfkDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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