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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45cfe61abf188b3a52c414e5d3b9a207ce6248443804838168ada2467c82cc1c' 
  AND token = '2gQjiiiATSXpfyK1LTtFeephvrChP40/fNwMHhNU7KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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