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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e634beaf3e5a6d97cc55726e7a2e7157afe2ca3153ce985f7d83ea61780e3f' 
  AND token = 'BLkSaZyYXsiW0MDYSg38ExnlAYPSxt02fInyI6NrcVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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