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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d87aa73f4b41eb71ddac5e0d9a5437c03960c4027915573a67775b4b6f5d37' 
  AND token = 'In0JAuyQo8uR/1g/1Wd4hahTJbbxFrROeKJkm6vfhZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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