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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14094c00442da9768187a2dd46397f688b62dc63735fc81d7683137154ea8ff' 
  AND token = 'udyZaW7lT0SiDGf9MG5y3eACmUDrh56Ev969HvosK3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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