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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1102640f94e46064f4182f4042445d7a2cd70c3cd22d01bab4332ff4de2a5c7' 
  AND token = 'dXFwllOvcER7jO8SJXFi605qEWCFfKOwN+EAYHoCMrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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