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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96391567c126f35205cc0f879a55ceb11ba6d99b1832b5645294daf5c42f734c' 
  AND token = 'SJXWHzNWWjBS5io2XR3Jy18y08IbzZCvF46bYjvoaI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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