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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3dc7f6adc5531ced49b6e9e5ec9507ad4128a9675995bf8a69e4cecfa0e564d' 
  AND token = '/3b9J9dCCmE4muv9Hcsbsrojy0otodf9yOGT0pMkFJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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