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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bab2f6e29eb3d59c8be76bbd009486e6d04710211dd5f8bc48dbdb9ee7964db' 
  AND token = 'SMryYx2cOB3qG6k0B+173OKrv77WpVf94sXFutFoYs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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