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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02aa70e463d1d447faac2f8b99ab71bb12c07a9264e175e8481ecebb277a8957' 
  AND token = 'aAH+DfM9vuQe1+N7Xsulj722Wxuc0HfhtZfJtvc45bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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