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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db17ea4c9ca88d2a2e1335ec14ca3656430bf9ed9e17ed9da6b95479b04a791' 
  AND token = 'EGQJKMotCEo3UuO3purcKGJj/kBrw+ECBHl5m3q0P1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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