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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '127bea15d1d553ea63a72dc700bda61195537f20f30a8e1a7865b5afb3725909' 
  AND token = 'zaDHUCgIOc4gKWei4ka48gWDIvbR0LPNdS4KFCcuSKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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