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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f4515e4d88e97e918ac02ec9f7f500a74fef815fce1c95f46d578a62c185401' 
  AND token = 'paubZQ5Y2zvafeJ2Ms8UGGkPkS+SDiJM2fRyeHvR13k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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