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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d510abf5f362297590bfc1ffa153d9fbd587cdec7b1f15e37f3b2b55e9a2e74' 
  AND token = 'b9CzxtooM7wwTCvxZJwC806nj/qCBJW8Njhy7kg4N7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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