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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b57fc718efec8d7afcf0e849f4d644aa6e86e361e765fa1ab48c8ad1f21ba0' 
  AND token = 'PKaJfbAchayuHM9Rw2mnA0IQKCZsK1N5jxm55zHOuwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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