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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3961d03ae341c909e9d3cefb2f380e4bb166da31c5a2397337829be9fcda765' 
  AND token = 'jrO63qSomLsQMVo5SA+NHSELZI48Mn0Vc9ZYP1DhDsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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