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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd940cf830ba0dbfe114966a92f3fd879474f3e64decf40ecb58e3ba7143b0269' 
  AND token = '7kjOb2mAXOKQQs1sZn/tV5VEi+qA1o0ueANhKF70m2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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