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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8dc60442a61a3c526cea6397c8b228b53224c651f9c2e911cc6d7c282ac5e10' 
  AND token = 'akanrQy6eHuL55q3EgkMy3BPp0djGJB6KhDFzIS0ogE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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