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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213dde10a2fd43474da45b8180173f486ce35c0589b4d66b497ea7ecb45a0f5f' 
  AND token = 'TKP+5Oqy9Jcj1RX7Fzbakc6JCH1cX/UT3R6OPkchdQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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