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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87565c0121d6a7fdf6348ee01099554e85577c3a5440e7389d616b2a413706aa' 
  AND token = 'gQyxjdYXKoukXSN2QCiJ/ijFiXb63nX4qsnb+b+5TRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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