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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3015581023997e6e847c1614ad2d33c10875eb62abfe9242e2d4cd0fe5fd16d' 
  AND token = 'mNp71c2+eMk+i5J3jl6+88ydq3XrLIu3FDD9ReWB510=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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