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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13666ee5f0db6b03cb3163f0c0eb613614be558c5945262d1e61a1ee658fa6b' 
  AND token = '2ZBOT/qGS9BMZ2NbPmt9UPXhrjAIPSjdvXRocj1Q/y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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