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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e38ac3f2f09f812bc7b3a349b25bccbf529b8e6f1a3af12fc01905a5fd9bb03' 
  AND token = 'A3ivwGzIVyrbNv8JxzhpR/EKY/cTdatz0qKrUUDPgi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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