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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2081604d5e4c1964d1212242616cee86ccdf173301a47b479afb16a4272c48e' 
  AND token = 'plTjlAyDo40tuGLvkEaAs+bT0f/PE1rqd7YObx3bG28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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