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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfa1c7b8f34058ce14c861d63340c39a0f7975ca262a2c92cc8972829dd0a12' 
  AND token = '4vt57s0TDKXPfB2sKj5cIBuv4Ax+r9/yRPSBDeg4PcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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