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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb7c063821f94a834e2a4a2ef1710aa02934594e5122f3aa354b11722706b9e' 
  AND token = '65UBmUAFjNwiMm67qWd5Q+mNJ2hNdHr73yT3WFZk9DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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