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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '162d2827a50edd3f954ed4377a2c71aeb31f14b35cf2055da6092eedfa638726' 
  AND token = 'nLpX9a53jyY+q6L89VzqV9mDkI6g1axKmYXew9/SpU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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