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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e46e6d2689b3dd5e77504a1a2f56e7ca075381e1fade936d909b25985b4c9a8e' 
  AND token = 'IvDNLeOW9HXEFHbwhGXUIrOtNr38+tZBYC/JG0BflOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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