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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292897c5fce869a80465b80195d084f272dd4b60cfc7270371c1b2090f42f746' 
  AND token = '2547GUbkCOgS8sU/pRxQFEoh2TxSRN/trH/Fp9A7brM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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