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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609cb3c7fa3f1349f0671851085cd1b69b527bb85f24ad4a9685370976c28f87' 
  AND token = 'EjQIiEBN84i1s9KjWpyCrTwBAdTHK/mV3PEyCM+g0Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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