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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd38cec332c4aa5cc1fafab5bc366f31a52bbf4f7c5ea24bbceede191ace3b5be' 
  AND token = 'X71h8A1sUlLUYCRvPaulJ9eyDmEzGziWTwtm4YG/Odo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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