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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3694d18046538c48ae590295d795a772a6064d86896fc86adda35baee770d99b' 
  AND token = '4ty2jK/FFxB/Si9/JJjc0v+IX9DAuKhQI3tGG1dz3yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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