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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e805fb4d207b3da928fad46e6169fe5a94f26ef0f0f28f5d36ea43d6fb871c' 
  AND token = 'ANKT+Xiuie92Ye69sYrDp5oEdxaiAHzNhd6YmZQOPLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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